IBM CP-40

CP-40

Developer	IBM Cambridge Scientific Center (CSC)
OS family	CP/CMS
Working state	Historic
Initial release	January 1967; 57 years ago (1967-01)
Marketing target	IBM mainframe computers
Available in	English
Platforms	A unique, specially modified IBM System/360 Model 40
Default user interface	Command-line interface
License	Proprietary
Succeeded by	CP-67

CP-40 was a research precursor to CP-67, which in turn was part of IBM's then-revolutionary CP[-67]/CMS – a virtual machine/virtual memory time-sharing operating system for the IBM System/360 Model 67, and the parent of IBM's VM family. CP-40 ran multiple instances of client operating systems – particularly CMS, the Cambridge Monitor System,^[1] built as part of the same effort. Like CP-67, CP-40 and the first version of CMS were developed by IBM's Cambridge Scientific Center (CSC) staff, working closely with MIT researchers at Project MAC and Lincoln Laboratory. CP-40/CMS production use began in January 1967. CP-40 ran on a unique, specially modified IBM System/360 Model 40.